12127128545439 has 12 divisors (see below), whose sum is σ = 17517113548272. Its totient is φ = 8084683089600.

The previous prime is 12127128545423. The next prime is 12127128545489. The reversal of 12127128545439 is 93454582172121.

12127128545439 is a `hidden beast` number, since 1 + 2 + 1 + 2 + 7 + 12 + 85 + 4 + 543 + 9 = 666.

It is not a de Polignac number, because 12127128545439 - 2⁴ = 12127128545423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12127128545489) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4652682 + ... + 6775079.

It is an arithmetic number, because the mean of its divisors is an integer number (1459759462356).

Almost surely, 2^{12127128545439} is an apocalyptic number.

12127128545439 is a deficient number, since it is larger than the sum of its proper divisors (5389985002833).

12127128545439 is a wasteful number, since it uses less digits than its factorization.

12127128545439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11545678 (or 11545675 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 54.

The spelling of 12127128545439 in words is "twelve trillion, one hundred twenty-seven billion, one hundred twenty-eight million, five hundred forty-five thousand, four hundred thirty-nine".